Electric-lamp mounting



March 2 1926. 1,575,548

C. H CUNO ELECTRIC LAMP MOUNTING Filed June 12, 1924 INVENTOR Patented Mar. 2, 1926.

UNITED stares PATENTOFFICE.

ci-i'ARLEs I-I, jouivo, OF MERIDEN, commences, assisnoa r0 THE o'UNo nnenvnna, 11m CORPORATION, or MERIDEN, oonzu'norrour, A GQRPORA'IIQN 0F CONNECTI- our.

ELECTRIGEAMP Mourrrme.

Application nice time 12, 1 Serial No. 719,536.

To all w/zom it may con/002w:

Be it known thatI, CHAnLns H. CUNo, a

citizen of the United States of America, re-

siding at Meriden, county of New Haven, State of Connecticut, have nvented new and useful Improvements in Electric-Lamp lllountings, of which the following is a specification.

My invention relates to a construction or method of construction particularly useful as a trouble lamp attachment for automobiles. What are commonly termed electric cigar lighters are frequently provided or installed on automobiles. These devices are of course in use only occasionally, although available whenever needed. Some cigar lighters employ a heating element which is removable or replaceable. The type of construction to which I refer will be found more -fully desoribed and shown in United States Letters Patents No. 1,345,368 and No. 1,460,- 095- According to my present invention I have provided a simple and inexpensive but durable lamp attachment which can be readily substituted for the heating unit of a cigar lighter. For economy in construction as well as accuracy in focusing and therefore maximum efficiency of light I prefer to construct the device of parts which are assembled in definite fixed relation by means of a simple form of jig.

Fig. 1 is a longitudinal cross sectional view showing an attachment embodying the improvements of my invention.

Fig. 2 shows the three principal partsof the casing and indicating the method of assembly.

Fig. 3 shows a longitudinal section of a modification.

The three principal parts of the preferred form are the tubular member 5, the body 6 and the reflector 7.

The tubular member contains in its inner end an insulating piece 8 having a longitudinal passagefor the sleeve 9 which contains a part of the plunger 10 and the spring 11 which presses the plunger outwardly. The shank of the tubular-member 5 is provided with one or more projecting'pins 12 adapted to engage in the bayonet slots of the socket of the cigar lighter or similar de vice (not shown). The outer end of the tubular member 5 is provided with one or more, preferably two, bayonet slots 14 secured tothe outer edge of the body 6.

-to the tubular member :ulapted to 'reeeive the pins 13 onthe neck let of an electric lamp bulb 15.

The body 6 is provided with a flange 16, in this instance turned inwardly, and soldered or otherwise suitably attached to the tubular member 5.

The reflector 7 is provided with a flange 17 which is soldered or otherwise suitably I also prefer to provide a glass 18 which may conveniently be held in of a split spring ring 19.

T o secure the maximum brilliancy of illumination it is of course highly desirable that the filament 20 of the lamp bulb be located at the focal center of the reflector 7. To insure this I prefer to assemble the parts of the casing of the attachment according to fixed plans and for that purpose I propose to employ a form of jig'as diagrammatically suggested in Fig. 2. It will be understood of course that the various parts of the casing or shell willbe made of standard sizes. To assemble them in proper relative positions I provide a holder having a member 21 for positioning the reflector, a shoulder such as 22 located in position to limit the insertion of the body 6 and a shoulder or abutment 23 to limit the insertion of the tubular member 5 to the proper distance so that when a standard bulb is inserted in the socket of the tubular member 5 the filament 20 will be at the focal-center of the reflector. This distance will be readily determined by experiment and fixed by the design of the jig. When the parts are assembled in their proper positions they will be secured together by soldering, riveting or in any other suitable manner.

In the'form shown in Fig. 3 the reflector 7 has a flange 16' which is secured directly 5 in such a position as to locate the bayonet slot 14 so as to bring the standard bulb filament at the focal center of the reflector.

I claim:

1. A lamp holder comprising a tubular body having an inwardly and reversely directed flange at one end, a reflector permanently secured to the other end, a tubular member permanently secured in said flange I place by means a tubular member secured in said flange,

said tubular member having in its outer end a locking pin adapted to fit in the bayonet slot of a socket and having in its end within said reflector a bayonet slot adapted to receive the locking pin of a standard lamp bulb at the proper distance to locate the filament of the bulb approximately at the focal center of thereflector.

CHARLES H. OUNO. 

